Fuel carburetion system



NOV. 10, 1953 J, W F, HQLL 2,658,732

` FUEL CARBURETION SYSTEM Filed Sept. 8, 1952 'f//f/f/Q/ 25 r i Flj. i A A fafa. :man

@ima/.rr I

IN VEN TOR.

Patented Nov. 10, 1953 UNlTED STATES FATENT OFFICE FUEL CARBURETION SYSTEM llames W. F. Holl, Temple City, Calif.

Application September 8, 1952,`Serial No. 308,491

8 Claims. 1

This invention relates 1to a carburetion system in which the lfuel lis injected lunder Isubstantially `constant pressure into the intake manifold of the engine-or the intake throat of that manifold. The volume ofthe fuel, however, is nvariable by the operatorof the machine.

A feature of my invention is to `.provide la car- `buretion `system in `which there is no venturi v-in themanifold adjacent the throttle val-ve. The

`fuel is injected adjacent `to the throttle and into `a `Straight walled passage, that is, the intake `throat `or conduit of `the intake manifold has a straight wall particularly in the area Vadjacent to .the throttle valve.

Still anotherobject of my invention is to provide a carburetion system in which the fuel can be either preheated prior `to injection into the "intake manifold, or it can be fed directly into the manifoldwithoutpreheating.

Another feature of my construction is that `a -relatively large intake manifold can be used as well as large intake Vvalves in the engine Vsince `velocity is not necessary to break up the fuel.

All of lthis produces `an engine in which there -is a less restricted passage for `the fuel mixture than in conventional carburetion, that is, there is better breathing of the engine. This advan- "tage results in better fuel economy due 'to accurate metering of the fuel'by a `variable volume pump. This pump is directly driven `by 'the en- "gine in the same Amanner as is common in diesel `the numeral -I indicates theintakemanifold or l the intake throat of this manifold. It is to ,be

noted that the intake passage I does not include a venturi but` the Walls thereof are straight. Also, this manifold is substantiallylarger in diameter than is usually employed by engines heretofore in use. A throttleor butterfly valve 2 is rotatably mounted in the manifold I and this throttle is controlled manually `or -zby means `of Ithe usual foot throttle, all of which will be subsequently described.

A variable volume :pump 3 `is driven preferably by the engine itself through suitable gearing or drive means, which will be `further described. The variable volume pump 3 may be of the type shown in `my Patent Number 2,359,553, issued October '3, 1944 for Variable Volume Rotary Pump. `Other variable volume rotary pumps may also bev employed if desired.

While the volumetric `output of the pump is varied 4to suit different engine speeds and loads, the pressure of the fuel is `substantially coni'stant, Yalthough even this Apressure may vary slightly. The rotary pump 3 consists `of' a housing `4 in which a chamber or cylinder 5 is formed.

`A rotor t is mountedin the chamber 5 and this rotor is a part of or is `iixedly attached to the shaft 'I, which projects from the housing 4 and is driven bythe engine through suitable gearing or drivemeans (not shown) To vary the output `of the pump, I provide ported cup lil which `rotates within the rotor `t and controls or adjusts the opening to the intake port 9 land the outlet `port Ill. The cup 8 is mounted on a shaft -II to rwhich an arm I2 is attached. JBy rotating the `arm I2 the shaft II will also be rotated thereby adjusting the cup `8 and in `turn varying the volumetric output of the .pu'mp`3. The pump .3 is alsonxedly mounted on or adjacent to the engine by ya suitable mounting pad or flange I3.

A fuel intakeline or .pipe vI4 'extends into the intake port I5 of the pump `and this pipe extends from the useful fuel tank IS which is mounted adjacent to the engine. An outlet pipe II extends from the outlet port I8 of the pump and this outlet pipe extends into a control valve I il.` The control valve It includes an elongated housing 2i! in which a cylinder `2l is formed. A

`pushrod A22 extends into the cylinder EI and a `pair of spaced pistons 23-24 `are xedly attached to the rod T22 and are -slidablewithin the cylinder 2I, substantially asshown. The intake port .25 Vof the valve I9 is positioned between the .pistons 2-3-2-4 and the port 25 opens` into an enlarged annular groove 26 which is formed in the cylinder 2I. A pair of outlet ports: il and 28l extend from thecylinder 2| and the outlet `pipes 29and Sil extend from the :ports 2l and .28 respectively.

Aheat insulation iitting SI screws into the outlet Vport 2`I,and the pipe 429 screws into this iit ting. `Therltting also includes la spring pressed ball y32 which `is-sea'ted when fuel is not flowing preferably adjacent to the throttle valve 2.

through'the pipe 29, thus preventing heat from beingtransmitted back into the cylinder 2 I. The pipe 29 is attached to the heating coil 33 in the exhaust manifold 3Q. From the coil 33 the pipe extends to a spray nozzle 35 within the intake manifold I and preferably adjacent the throttle valve 2. The Vpipe 3E extends to a second spray nozzle 36, also opening into the manifold l and An annular groove 3l around the cylinder 2| opens into the outlet port 2l. A similar annular groove 38 opens into the outlet port 23. The purpose of these grooves is to permit fuel to pass around the pistons 23 and 2d if the piston should be positioned exactly within these grooves, as shown l by the position of the piston 23 in Figure 2.

The throttle valve 2 is rotated to control the amount of air passing through the manifold I in the usual manner, which includes a rod 3S connected at one end to the throttle 2 and at the other end to the foot throttle lill. The arm l2 of the pump 3 is pivotally attached to the rod 39 so that the volumetric output of the pump 3 is adjusted at the same time that the throttle 2 is opened or closed. An arm 4| is secured at one end to the push-pull-rod 22 and the other end of this arm is pivotally secured to a bracket 42. The arm 4l is also pivotally secured to the rod 39 so that the arm 4| will be moved with the rod 39 as the throttle valve 2 is adjusted. Movement of the arm il will push or pull the rod 22,

thus moving the pistons 23--24 relative to the Youtlet ports 21-28.

off the outlet port 28 and all of the fuel to theV engine will, therefore, be preheated or vaporized.

' This condition continues until the piston 23 Ypasses to the right of the outlet port 21 and at this point the outlet port 28 is uncovered and raw fuel is then directed from the rpump 3 through the pipeV 39, and is directed into the manifold l, through the nozzle 3B. This is the condition necessary Yfor high speeds of the engine and also for heavy pulling.

The position of the foot throtue at, therefore,

will determine the adjustment of the variable volume pump 3 and the volumetric output of that pump. This same position of the foot throt- From zero or idling position of the l tle will alsoY determine whether the fuel is directed to a heating coil and thence into the intake manifold, or if the fuel is injected directly into the intake manifold without preheating.

The position of the foot throttle a1so, of course,Y

a pipe extending from one of said ports to one of the spray nozzles, a second pipe extending from the second port to another of the spray nozzles, and means to manually adjust said piston in the valve to direct flow to either of said outlet ports.

2. A fuel carburetion system including an intake manifold, a throttle valve rotatably mounted in said manifold, two spray nozzles each extending into the manifold adjacent said throttle Valve, a variable volume fuel pump, means on the pump to adjust the volume of said pump, a oontrol valve, said control valve having a piston slidably mounted therein, said valve having an intake port, a pipe extending from the fuel pump to the intake port, two outlet ports in said Valve, a pipe extending from one of said ports to one of the spray nozzles, a second pipe Vextending from the second port to Vanother of the spray nozzles, and means to manually adjust said piston in the valve to direct flow to either of said Youtlet ports, and heating means for the fuel extending from one of said outlet ports.

3. A fuel carburetionsystem for engines including an intake manifold, a throttle valve ro'-V tatably mounted in the manifold, two spray nozzles extending into the manifold adjacent said throttle valve, a variable volume pump, a con-V trol Valve, said control valve having a cylinder therein, a piston slidably mounted in the cylinder, a piston rod extending out of the control valve, an accelerator rod attached to the throttle valve at one end thereof, a control arm on the variable Vvolume pump, said control arm being pivotally attached at one end to the accelerator rod, an arm attached to said piston rod and to the acceleratoi` rod whereby the variable volume pump and the control valve are simultaneously adjust- Y ed by movement of the control rod, said control valve having an intake port therein, a pipe extending fromthe pump to said intake port, two Y outlet ports extending from the control valve,

`a pipe extending from eachV of the outletports to one of the spray nozzles, the piston in the control valve being adjustable to direct fuel to either of said outlet ports.

l. AV fuel carburetion system for engines in- Y cluding an intake manifold, a throttle valve rotatably mounted in the manifold, two spray nozzles extending into the manifold adjacent said throttle valve, a variable volume pump, a control valve, said control valve having a cylinder therein, a piston slidably mounted inthe cylinder,

a piston rod extending out of the control valve,

Van accelerator rod attached to the throttle-valve at one end thereof,'a control arm on the variable volume pump, said control arm beingpivotally attached at oneA end Vto the accelerator rod, an

arm attached to said; piston rod and to the acdetermines the positionY of the throttle valve 2 and,` therefore, the amount of admitted air Vthrough the manifold l.

Having described my invention, I claim: Y .1. A fuel carburetion systemrincludingan in- 'take manifold, a throttle valve rotatably Vmounted in said manifold, two spray nozzles each extending into the manifold adjacent said throttle valve, a variable volume fuel pump, means on the pump to adjust the volume of ,said pump, a control valve, said control valve having a pistonV slidablyfmountedtherein, said valve having an intake port, a' pipe extending from the fuel pump toV the intake port, two outlet ports in said valve,

- said spray nozzles. Y Y l V5. A Vfuel carburetion system for engines iricelerator rod'whereby the variable volume pump and the control valve are simultaneously adjustl ed by movementof the control rod, said control l valve having an intake port therein, a pipe extending from the pump to said intake port, two

outlet ports extending Vfrom the control valve,

a pipe extending from each ofthe outlet ports to rounding' one of the pipes extending-to one of cluding anintake manifold of theengine, 1a

throttle valve rotatablyV mounted inV said manifold, Vtwospray nozzles extending into'thenanifold adjacent said throttle valve, a variable volume fuel pump, a control valve, said Valve having a cylinder therein, a piston rod extending into said cylinder, two spaced pistons mounted on the rod within the cylinder, said control valve having an intake port extending into the cylinder between the pistons, and a pair of spaced outlet ports extending froni the cylinder, said pistons selectively closing 01T either of the outlet ports, a pipe extending from the pump to the intake port of the valve, a pipe extending from each of the outlet ports to one of the spray nozzles.

6. A fuel carburetion system for engines including an intake manifold of the engine, a throttle valve rotatably mounted in said manifold, two spray nozzles extending into the manifold adjacent said throttle valve, a variable volume fuel pump, a control valve, said valve having a cylinder therein, a piston rod extending into said cylinder, two spaced pistons mounted on the rod within the cylinder, said control valve having an intake port extending into the cylinder between the pistons, and a pair of spaced outlet ports extending from the cylinder, said pistons selectively closing 01T either of the outlet ports, a pipe extending from the pump to the intake port of the valve, a pipe extending from each of the outlet ports to one of the spray nozzles, a control means, and means connecting said control means in the variable volume to adjust said pump, and another means extending from the first named means to said piston rod to adjust the pistons in said valve.

7. A fuel carburetion system for engines including an intake manifold of the engine, a throttle valve rotatably mounted in said manifold, two spray nozzles extending into the manifold adjacent said throttle valve, a variable volume fuel pump, a control valve, said valve having a cylinder therein, a piston rod extending into said cylinder, two spaced pistons mounted on the rod within the cylinder, said control valve having an intake port extending into the cylinder between the pistons, and a pair of' 'sped outlet ports extending from the cylinder, said pistons selectively closing off either of the outlet ports, a pipe extending from the pump to the intake port of the valve, a pipe extending from each of the outlet ports to one of the spray nozzles, and heating means surrounding one of the pipes extending to one of said spray nozzles.

8. A fuel carburetion system for engines including an intake manifold of the engine, a throttle valve rotatably mounted in said manifold, two spray nozzles extending into the manifold adjacent said throttle valve, a variable volume fuel pump, a control valve, said valve having a cylinder therein, a piston rod extending into said cylinder, two spaced pistons mounted on the rod within the cylinder, said control valve having an intake port extending into the cylinder between the pistons, and a pair of spaced outlet ports extending from the cylinder, said pistons selectively closing off either of the outlet ports, a pipe extending from the pump to the intake port of the valve, a pipe extending from each of the outlet ports to one of the spray nozzles, a control means, and means connecting said control means in the variable volume pump to adjust said pump, and another means extending from the rst named means to said piston rod to adjust the pistons in said valve, and heating means surrounding one of the pipes extending to one of said spray nozzles.

JAMES W. F. HOLL.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 2,008,143 Mock July 16, 1935` 2,562,656 Blakeslee July 31, 1951` FOREIGN PATENTS Number Country Date 452,246 Great Britain Aug. 19, 1936i 

